Display device and data driver

ABSTRACT

A display device can include a display panel having data lines, gate lines and subpixels; a data driver to supply a video data signal including a first signal segment and a second signal segment maintaining a predetermined voltage difference to each of the data lines, and output readout data in response to signal sensing through each of the data lines; and a touch controller. Also, the video data signal serves as both a display driving signal and a touch driving signal, and in the video data signal, the second signal segment has a variable voltage representing a gray level for image display, the predetermined voltage difference is substantially constantly maintained so the video data signal serves as a touch driving signal, and the first signal segment has a variable voltage configured to maintain the predetermined voltage difference in accordance with the variable voltage of the second signal segment.

CROSS REFERENCE TO RELATED APPLICATION

This application is a Continuation of U.S. patent application Ser. No.17/472,059 filed on Sep. 10, 2021, which is a Continuation of U.S.patent application Ser. No. 16/862,139, filed on Apr. 29, 2020 (now U.S.Pat. No. 11,144,147 issued on Oct. 12, 2021), which claims prioritybenefit from Korean Patent Application No. 10-2019-0050562, filed in theRepublic of Korea on Apr. 30, 2019, all of these applications are herebyincorporated by reference for all purposes as if fully set forth herein.

BACKGROUND Field

Embodiments of the present invention relate to a display device and adata driver, and a driving method.

Description of Related Art

Along with the development of the information society, demand fordisplay devices for displaying images is increasing.

Among such display devices, touch display devices provide touch-baseduser interfaces enabling users to intuitively and conveniently inputdata or instructions directly to devices, rather than using general datainput systems, such as buttons, a keyboard, or a mouse.

Such a display device should be provided with a touchscreen panelincluding touch sensors to enable touch sensing. This may make thefabrication process of the display device complicated and difficult. Inaddition, since the display device should be provided with the displaypanel and the touchscreen panel, the size of the display device may beinevitably increased, which may be a limitation.

In addition, since the display device should provide both an imagedisplay function and a touch sensing function, the display device shoulddivide a driving time, such as a frame time, into a display drivingperiod and a touch driving period to perform display driving during thedisplay driving period and sense a touch by touch driving during thetouch driving period subsequent to the display driving period.

In such a general time division driving method, both the display drivingtime and the touch driving time may be insufficient, thereby possiblydegrading both the display quality and touch sensitivity, which may beproblematic. In particular, the application of the touch sensingfunction may have an impact on providing high-resolution andhigh-quality images.

BRIEF SUMMARY

Embodiments of the present invention can provide a display device, adata driver, and a driving method able to perform both display drivingand touch sensing without being separately provided with a touchscreenpanel.

In addition, the embodiments can provide a display device, a datadriver, and a driving method able to simultaneously perform the displaydriving and the touch sensing.

In addition, the embodiments can provide a display device, a datadriver, and a driving method able to perform the touch sensing withoutbeing separately provided with a dedicated touch sensor structure.

In addition, the embodiments can provide a display device, a datadriver, and a driving method able to perform the touch sensing usingsubpixels designed for the display driving.

In addition, the embodiments can provide a display device, a datadriver, and a driving method able to perform touch driving using a videodata signal intended for the display driving.

According to an aspect, the embodiments can provide a display deviceincluding: a display panel in which a plurality of data lines and aplurality of gate lines are disposed and a plurality of subpixels arearrayed; and a data driver supplying a video data signal including afirst signal segment and a second signal segment maintaining apredetermined voltage difference to each of the plurality of data linesand outputting readout data in response to signal sensing through eachof the plurality of data lines to which the video data signal issupplied.

The display device can further include a touch controller detecting atouch or determining touch coordinates in accordance with the readoutdata.

Even in a case in which a voltage value of each of the first signalsegment and the second signal segment supplied to each of the pluralityof data lines changes, the voltage difference between the first signalsegment and the second signal segment of the embodiments can bemaintained to be constant.

According to the embodiments, during a period in which a gate signalhaving a turn-on voltage level is sequentially supplied to each of mnumber of gate lines among the plurality of gate lines, where the m is anatural number equal to or greater than 2, the data driver can outputthe readout data regarding a single touch sensor block, based on sensingsignals sensed through n number of data lines among the plurality ofdata lines, respectively, where the n is a natural number equal to orgreater than 2. The single touch sensor block corresponds to subpixelsdefined by the m number of gate lines and the n number of data lines,among the plurality of subpixels.

According to the embodiments, each of the plurality of subpixels caninclude an emitting device; a driving transistor driving the emittingdevice and including a first node, a second node, and a third node; afirst transistor electrically connected between the first node and adata line among the plurality of data lines; and a storage capacitorelectrically connected between the first node and the second node andincluding a first plate and a second plate.

The first plate of the storage capacitor being electrically connected tothe first node of the driving transistor, and the second plate beingelectrically connected to the second node of the driving transistor.

According to the embodiments, the display device can further include achannel shield pattern overlapping a channel area of the drivingtransistor, wherein the channel shield pattern is electrically connectedto the first plate of the storage capacitor.

According to the embodiments, the display device can further include aplurality of shield lines present corresponding to the plurality of datalines to shield the plurality of data lines and surrounding conductorslocated around the plurality of data lines from each other.

The data driver can supply a shield driving signal to each of theplurality of shield lines, the shield driving signal corresponding tothe video data signal supplied to a corresponding data line among theplurality of data lines.

The gate signal can include a segment, a voltage level of which changesby an amplitude corresponding to the voltage difference between thefirst signal segment and the second signal segment of the video datasignal.

The display panel can display a fake video while displaying a realvideo.

The fake video can be a black video or a low-gray video.

The data driver can output the fake video data signal corresponding tothe fake video as the video data signal including the first signalsegment and the second signal segment having the predetermined voltagedifference.

The fake video data signal can swing while having the first signalsegment and the second signal segment having the predetermined voltagedifference, at a voltage equal to or lower than a low-gray voltage.

In another aspect, the embodiments can provide a data driver for drivinga plurality of data lines disposed in a display panel. The data drivercan include a latch circuit storing video data; a digital-to-analogconverter converting the video data into an analog video signal in aform of an analog voltage; and a simultaneous driving circuit supplyinga video data signal based on the analog video signal to each of theplurality of data lines, the video data signal including a first signalsegment and a second signal segment maintaining a predetermined voltagedifference, and outputting readout data in response to signal sensingthrough each of the plurality of data lines to which the video datasignal is supplied.

Even in a case in which a voltage value of each of the first signalsegment and the second signal segment supplied to each of the pluralityof data lines changes, the voltage difference between the first signalsegment and the second signal segment can be maintained to be constant.

According to the embodiments, during a period in which a gate signalhaving a turn-on voltage level is sequentially supplied to each of mnumber of gate lines among the plurality of gate lines, where the m is anatural number equal to or greater than 2, the simultaneous drivingcircuit can output the readout data regarding a single touch sensorblock, based on sensing signals sensed through n number of data linesamong the plurality of data lines, respectively, where the n is anatural number equal to or greater than 2. The single touch sensor blockcorresponds to subpixels defined by the m number of gate lines and the nnumber of data lines, among the plurality of subpixels.

According to the embodiments, the simultaneous driving circuit caninclude a plurality of simultaneous driving amplifiers supplying thevideo data signal to n number of data lines among the plurality of datalines, respectively; a plurality of analog-to-digital convertersconverting the sensing signals, sensed through the n number of datalines by the plurality of simultaneous driving amplifiers, to digitalsensing values; and an integration circuit generating and outputtingreadout data regarding the single touch sensor block corresponding tothe subpixels defined by the m number of gate lines and the n number ofdata lines by integrating the sensing values output from the pluralityof analog-to-digital converters.

The simultaneous driving circuit can include a plurality of simultaneousdriving amplifiers supplying the video data signal to each of n numberof data lines among the plurality of data lines; an integration circuitoutputting an integrated sensing signal by integrating the sensingsignals sensed through the n number of data lines among the plurality ofdata lines by the plurality of simultaneous driving amplifiers; and ananalog-to-digital converter outputting readout data based on theintegrated sensing signal, regarding the single touch sensor blockcorresponding to the subpixels defined by the m number of gate lines andthe n number of data lines.

The simultaneous driving circuit can include a shield driverelectrically connected to a plurality of shield lines presentcorresponding to the plurality of data lines to shield the plurality ofdata lines and surrounding conductors located around the plurality ofdata lines from each other.

The shield driver can supply a shield driving signal to each of theplurality of shield lines, the shield driving signal corresponding tothe video data signal supplied to a corresponding data line among theplurality of data lines.

The simultaneous driving circuit can include a plurality of simultaneousdriving amplifiers supplying the video data signal to the plurality ofdata lines, respectively, and sensing the plurality of data lines,respectively.

Each of the plurality of simultaneous driving amplifiers can include anoperation amplifier including a first input port through which the videodata signal is input, a second input port connected to a data line amongthe plurality of data lines to output the video data signal, inputthrough the first input port, to the data line, and an output portoutputting a sensing signal sensed through the data line; and a feedbackcapacitor electrically connected to the second input port and the outputport.

The simultaneous driving circuit can further include a plurality ofoutput buffers supplying the video data signal to each of the pluralityof data lines.

Each of the plurality of output buffers can include a buffer input portthrough which the video data signal is input and a buffer output portelectrically connected to the data line.

The data line can be electrically connected to the second input port ofeach of the plurality of simultaneous driving amplifiers during a firstdriving timing period, and can be electrically connected to the bufferoutput port of each of the plurality of output buffers during a seconddriving timing period after the first driving timing period.

The video data signal can include the first signal segment, the secondsignal segment continuing from the first signal segment, and a thirdsignal segment continuing from the second signal segment.

A voltage difference between the second signal segment and the thirdsignal segment can be zero or smaller than the voltage differencebetween the first signal segment and the second signal segment.

The first signal segment and the second signal segment of the video datasignal can be output to a corresponding data line among the plurality ofdata lines through a simultaneous driving amplifier among the pluralityof simultaneous driving amplifiers during the first driving timingperiod.

The third signal segment of the video data signal can be output to thecorresponding data line through a corresponding output buffer among theplurality of output buffers during the second driving timing period ofthe video data signal.

The display panel can display a fake video while displaying a realvideo. In this case, the simultaneous driving circuit outputs the fakevideo data signal corresponding to the fake video as the video datasignal including the first signal segment and the second signal segmenthaving the predetermined voltage difference.

When the gate signal having the turn-on voltage level is supplied to twoor more gate lines among the plurality of gate lines, the simultaneousdriving circuit can simultaneously supply the fake video data signal tosubpixels included two or more rows of subpixels corresponding to thetwo or more gate lines, among the plurality of subpixels.

The fake video data signal can swing while having the first signalsegment and the second signal segment having the predetermined voltagedifference, at a voltage equal to or lower than a low-gray voltage.

The first signal segment of the fake video data signal can have apredetermined first voltage value, the second signal segment of the fakevideo data signal can have a predetermined second voltage value, and avoltage difference between the first voltage value and the secondvoltage value can be constant.

In another aspect, the embodiments can provide a method of driving adisplay device, the display device including a display panel in which aplurality of data lines and a plurality of gate lines are disposed and aplurality of subpixels are arrayed and a data driver driving theplurality of data lines.

The method of driving a display device according to the embodiments caninclude supplying a video data signal to each of the plurality of datalines; generating readout data based on signals sensed through theplurality of data lines, respectively, in response to the video datasignal supplied to the plurality of data lines; and detecting a touch ordetermining touch coordinates in accordance with the readout data.

According to the embodiments, both display driving and touch sensing canbe performed, even in a case in which the touchscreen panel is notseparately provided. Accordingly, the size of the display device can bereduced, and the ease of fabrication of the display device can beincreased.

In addition, according to the embodiments, the display driving and thetouch sensing can be simultaneously performed. Accordingly,high-resolution images can be displayed, and a sufficient amount of timefor the touch sensing can be obtained.

In addition, according to the embodiments, the touch sensing can beperformed, even in a case in which a dedicated touch sensor structure isnot separately provided.

In addition, according to the embodiments, the touch sensing can beperformed using the subpixels designed for the display driving.Accordingly, a process of fabricating dedicated touch sensors in thepanel is unnecessary, and the thickness of the panel can be reduced.

In addition, according to the embodiments, the touch driving can beperformed using the video data signal intended for the display driving.Accordingly, it is unnecessary to generate a touch driving signal forthe touch driving, and a driving operation can be easier.

DESCRIPTION OF DRAWINGS

The above and other objects, features, and advantages of the presentdisclosure will be more clearly understood from the following detaileddescription, taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a diagram illustrating a system configuration of a displaydevice according to one or more embodiments of the present invention;

FIG. 2 is an equivalent circuit diagram illustrating a subpixel in thedisplay device according to one or more embodiments of the presentinvention;

FIG. 3 is another equivalent circuit diagram illustrating a subpixel inthe display device according to one or more embodiments of the presentinvention;

FIG. 4 is a diagram illustrating an arrangement of subpixels and signallines in the display device according to one or more embodiments of thepresent invention;

FIG. 5 is a diagram illustrating a planar structure of a subpixel in thedisplay device according to one or more embodiments of the presentinvention;

FIG. 6 is a diagram illustrating a structure and method by which thedisplay device according to one or more embodiments of the presentinvention can simultaneously perform display driving and touch sensing;

FIG. 7 is a diagram illustrating an arrangement of subpixels, datalines, gate lines, and storage capacitors for explaining a simultaneousdriving structure and a simultaneous driving method of the displaydevice according to one or more embodiments of the present invention;

FIG. 8 is a gate driving timing diagram in case of simultaneous drivingof the display device according to one or more embodiments of thepresent invention;

FIG. 9 is a diagram illustrating a first video data signal supplied to afirst data line and a second video data signal supplied to a second dataline in case of simultaneous driving of the display device according toone or more embodiments of the present invention;

FIG. 10 is a diagram illustrating a first video data signal supplied toa first data line with the elapse of a driving time in case ofsimultaneous driving of the display device according to one or moreembodiments of the present invention;

FIG. 11 is a diagram illustrating a configuration of a data driver ofthe display device according to one or more embodiments of the presentinvention;

FIG. 12 is a diagram illustrating a simultaneous driving circuit in thedata driver of the display device according to one or more embodimentsof the present invention;

FIG. 13 is a diagram illustrating a structure of connecting a firstplate of the storage capacitor and a channel shield pattern to improvetouch sensitivity of the display device according to one or moreembodiments of the present invention;

FIG. 14 is a diagram illustrating components, such as a shield line forshielding a data line and a shield driver, for improving touchsensitivity in the display device according to one or more embodimentsof the present invention;

FIG. 15 is a diagram illustrating a structure of the shield line forimproving touch sensitivity in the display device according to one ormore embodiments of the present invention;

FIG. 16 is a diagram illustrating a shield driving signal supplied tothe shield line for improving touch sensitivity in the display deviceaccording to one or more embodiments of the present invention;

FIG. 17 is a diagram illustrating the simultaneous driving circuit foraccurate display driving in case of simultaneous driving of the displaydevice according to one or more embodiments of the present invention;

FIG. 18 is a diagram illustrating a video data signal output by twodriving elements (i.e., a simultaneous driving amplifier and an outputbuffer) included in the simultaneous driving circuit for accuratedisplay driving in case of simultaneous driving of the display deviceaccording to one or more embodiments of the present invention;

FIG. 19 is a diagram illustrating an integration sensing process forincreasing touch sensitivity and touch driving efficiency in case ofsimultaneous driving of the display device according to one or moreembodiments of the present invention;

FIG. 20 is an example diagram illustrating the simultaneous drivingcircuit performing a first integration sensing process to increase touchsensitivity and touch driving efficiency in case of simultaneous drivingof the display device according to one or more embodiments of thepresent invention;

FIG. 21 is an example diagram illustrating the simultaneous drivingcircuit performing a second integration sensing process to increasetouch sensitivity and touch driving efficiency in case of simultaneousdriving of the display device according to one or more embodiments ofthe present invention;

FIG. 22 is a detailed diagram illustrating the simultaneous drivingcircuit performing the second integration sensing process to increasetouch sensitivity and touch driving efficiency in case of simultaneousdriving of the display device according to one or more embodiments ofthe present invention;

FIG. 23 is a diagram illustrating the operation timing of switchelements in the simultaneous driving circuit;

FIG. 24 is a diagram illustrating fake driving for improving the motionpicture response time of the display device according to one or moreembodiments of the present invention;

FIG. 25 is a diagram illustrating a video data signal serving as a touchdriving signal in a case in which touch driving is performed inassociation with fake driving for improving the motion picture responsetime of the display device according to one or more embodiments of thepresent invention; and

FIG. 26 is a flowchart illustrating a driving method of the displaydevice according to one or more embodiments of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the following description of examples or embodiments of the presentinvention, reference will be made to the accompanying drawings in whichit is shown by way of illustration specific examples or embodiments thatcan be implemented, and in which the same reference numerals and signscan be used to designate the same or like components even when they areshown in different accompanying drawings from one another. Further, inthe following description of examples or embodiments of the presentinvention, detailed descriptions of well-known functions and componentsincorporated herein will be omitted when it is determined that thedescription can make the subject matter in some embodiments of thepresent invention rather unclear. The terms such as “including”,“having”, “containing”, and “constituting” used herein are generallyintended to allow other components to be added unless the terms are usedwith the term “only”. As used herein, singular forms are intended toinclude plural forms unless the context clearly indicates otherwise.

Terms, such as “first”, “second”, “A”, “B”, “(A)”, or “(B)” can be usedherein to describe elements of the present invention. Each of theseterms is not used to define essence, order, sequence, or number ofelements etc., but is used merely to distinguish the correspondingelement from other elements.

When it is mentioned that a first element “is connected or coupled to”,“overlaps” etc. a second element, it should be interpreted that, notonly can the first element “be directly connected or coupled to” or“directly overlap” the second element, but a third element can also be“interposed” between the first and second elements, or the first andsecond elements can “be connected or coupled to”, “overlap”, etc. eachother via a fourth element. Here, the second element can be included inat least one of two or more elements that “are connected or coupled to”,“overlap”, etc. each other.

When time relative terms, such as “after”, “subsequent to”, “next”,“before”, and the like, are used to describe processes or operations ofelements or configurations, or flows or steps in operating, processing,manufacturing methods, these terms can be used to describenon-consecutive or non-sequential processes or operations unless theterm “directly” or “immediately” is used together.

In addition, when any dimensions, relative sizes etc. are mentioned, itshould be considered that numerical values for an elements or features,or corresponding information (e.g., level, range, etc.) include atolerance or error range that can be caused by various factors (e.g.,process factors, internal or external impact, noise, etc.) even when arelevant description is not specified. Further, the term “may” fullyencompasses all the meanings of the term “can”.

FIG. 1 is a diagram illustrating a system configuration of a displaydevice 100 according to one or more embodiments of the presentinvention. All the components of the display device according to allembodiments of the present invention are operatively coupled andconfigured.

Referring to FIG. 1 , the display device 100 according to one or moreembodiments can include a display panel 110 in which a plurality of datalines DL and a plurality of gate lines GL are disposed and a pluralityof subpixels SP defined by the plurality of gate lines DL and theplurality of data lines GL are arrayed; and a driving circuit drivingthe display panel 110.

In terms of functions, the driving circuit can include a data driver 120driving the plurality of data lines DL, a gate driver 130 driving theplurality of gate lines GL, a display controller 140 controlling thedata driver 120 and the gate driver 130, and the like.

In the display panel 110, the plurality of data lines DL and theplurality of gate lines GL can be disposed to intersect each other. Forexample, the plurality of data lines DL can be disposed in rows orcolumns, and the plurality of gate lines GL can be disposed in columnsor rows. Hereinafter, for the sake of brevity, the plurality of datalines DL will be described as being disposed in columns, while theplurality of gate lines GL will be described as being disposed in rows.

The display controller 140 controls the data driver 120 and the gatedriver 130 by supplying a variety of control signals such data controlsignals DCS and gate control signals GCS necessary for drivingoperations of the data driver 120 and the gate driver 130.

The display controller 140 starts scanning at times (or points in time)defined by frames, converts video data received from an external sourceinto a data signal format readable by the data driver 120 and outputsconverted video data Data, and controls the data driving at appropriatetimes according to the scanning.

The display controller 140 receives a variety of timing signals, inaddition to the video data, from an external source (e.g., a hostsystem). The timing signals can include a vertical synchronizationsignal Vsync, a horizontal synchronization signal Hsync, an input dataenable signal DE, a clock signal CLK, and the like.

The display controller 140, in addition to converting video datareceived from an external source into a data signal format readable bythe data driver 120 and outputting the converted video data Data,receives the variety of timing signals, such as the verticalsynchronization signal Vsync, the horizontal synchronization signalHsync, the input data enable signal DE, and the clock signal CLK,generates a variety of control signals, and outputs the control signalsto the data driver 120 and the gate driver 130 in order to control thedata driver 120 and the gate driver 130.

For example, the display controller 140 outputs a variety of gatecontrol signals GCS, including a gate start pulse GSP, a gate shiftclock signal GSC, a gate output enable signal GOE, and the like, tocontrol the gate driver 130.

Here, the gate start pulse GSP controls operation start times of the oneor more gate driver integrated circuits (GDICs) constituting the gatedriver 130. The gate shift clock GSC is a clock signal commonly input tothe one or more GDICs to control shift times of a gate signal (i.e.,gate pulse). The gate output enable signal GOE designates timinginformation of the one or more GDICs.

In addition, the display controller 140 outputs a variety of datacontrol signals DCS, including a source start pulse SSP, a sourcesampling clock SSC, a source output enable signal SOE, and the like, tocontrol the data driver 120.

Here, the source start pulse SSP controls data sampling start times ofthe one or more source driver integrated circuits (SDICs) of the datadriver 120. The source sampling clock SSC is a clock signal thatcontrols sampling times of data in each of the SDICs. The source outputenable signal SOE controls output times of the data driver 120.

The display controller 140 can be a timing controller used in typicaldisplay technology or can be a control device including a timingcontroller to perform other control functions.

The display controller 140 can be provided as a component separate fromthe data driver 120 or can be provided as an integrated circuit (IC)together with the data driver 120.

The data driver 120 drives the plurality of data lines DL by receivingthe video data used for image display from the display controller 140and supplying a data voltage to the plurality of data lines DL. Herein,the data driver 120 will also be referred to as a source driver.

The data voltage can be a signal the same as an analog video signalobtained by converting the video data into an analog voltage or a signalobtained by converting the analog video signal by processing, such asamplification. Hereinafter, the data voltage will also be referred to asa video data signal.

The data driver 120 can include one or more source driver integratedcircuits (SDICs).

Each of the SDICs can include a shift register, a latch circuit, adigital-to-analog converter (DAC), an output buffer, and the like.

In some cases, each of the SDICs can further include ananalog-to-digital converter (ADC).

Each of the SDICs can be connected to a bonding pad of the display panel110 by a tape-automated bonding (TAB) method or a chip-on-glass (COG)method, can be directly mounted on the display panel 110, or in somecases, can be provided as an integrated portion of the display panel110. In addition, each of the SDICs can be implemented using achip-on-film (COF) structure mounted on a film connected to the displaypanel 110.

The gate driver 130 sequentially drives the plurality of gate lines GLby sequentially supplying the gate signal to plurality of gate lines GL.Herein, the gate driver 130 will also referred to as a scan driver.

The gate signal is a signal applied to a gate electrode of a transistorin each of the subpixels SP through a corresponding gate line GL, andwill also be referred to as a scan signal.

The gate driver 130 can include one or more gate driver integratedcircuits (GDICs).

Each of the gate driver integrated circuits can include a shiftregister, a level shifter, and the like.

Each of the gate driver integrated circuits can be connected to abonding pad of the display panel 110 by a TAB method or a COG method,can be implemented using a gate-in-panel (GIP) structure directlymounted on the display panel 110, or in some cases, can be provided asintegrated portion of the display panel 110. In addition, each of thegate driver integrated circuits can be implemented using a COF structuremounted on a film connected to the display panel 110.

The gate driver 130 sequentially supplies the gate signal to theplurality of gate lines GL under the control of the display controller140. Here, the gate signal can include a signal segment having a turn-onvoltage level by which the corresponding transistor can be turned on anda signal segment having a turn-off voltage level by which thecorresponding transistor can be turned off.

When a specific gate line is opened by the gate driver 130, the datadriver 120 converts the video data, received from the display controller140, into an analog data voltage (i.e., the video data signal) andsupplies the analog data voltage to the plurality of data lines DL.

The data driver 120 can be located on one side of (above or below) thedisplay panel 110, or in some cases, on both sides of (e.g., above andbelow) the display panel 110, depending on the driving method, thedesign of the panel, or the like.

The gate driver 130 can be located on one side (e.g., to the left orright) of the display panel 110, or in some cases, on both sides (e.g.,to the left and right) of the display panel 110, depending on thedriving method, the design of the panel, or the like.

The display device 100 according to embodiments can be, for example, anorganic light-emitting diode (OLED) display device, a liquid crystaldisplay (LCD) device, a plasma display device, or the like.

In a case in which the display device 100 according to embodiments is anLCD device, each of the subpixels SP of the display panel 110 includes apixel electrode, a transistor for delivering the data voltage to thepixel electrode, and the like. A common electrode to which a commonvoltage is applied can be disposed in the display panel 110 to generatean electric field together with a pixel voltage (i.e., the data voltage)in the pixel electrode of each of the subpixels SP.

In a case in which the display device 100 according to embodiments is anOLED display device, each of the subpixels SP arrayed in the displaypanel 110 can include a self-emissive OLED and a circuit element, suchas a driving transistor, for driving the OLED.

The type and number of circuit elements of each of the subpixels SP canbe variously determined, depending on functions to be provided, thedesign, and the like.

Hereinafter, the display device 100 according to embodiments will bedescribed as being an OLED display device for the sake of brevity.

FIG. 2 is an equivalent circuit diagram illustrating each of thesubpixels SP in the display device 100 according to one or moreembodiments. FIG. 3 is another equivalent circuit diagram illustratingeach of the subpixels SP in the display device 100 according toembodiments.

Referring to FIG. 2 , in the display device 100 according to one or moreembodiments, each of the subpixels SP can include an emitting device EDemitting light, a driving transistor DT driving the emitting device ED,a first transistor T1 electrically connected to a first node N1 of thedriving transistor DT and a corresponding data line DL, a storagecapacitor Cst electrically connected to the first node N1 and a secondnode N2 of the driving transistor DT, and the like.

The emitting device ED can include a first electrode E1, an emissivelayer EL, a second electrode E2, and the like.

In the emitting device ED, the first electrode E1 can be an anode, whilethe second electrode E2 can be a cathode. Alternatively, in the emittingdevice ED, the first electrode E1 can be a cathode, while the secondelectrode E2 can be an anode.

The first electrode E1 of the emitting device ED can be electricallyconnected to the second node N2 of the driving transistor DT.

A base voltage EVSS can be applied to the second electrode E2 of theemitting device ED. Herein, the base voltage EVSS can be, for example, aground voltage or a voltage similar to the ground voltage.

The driving transistor DT drives the emitting device ED by supplying adriving current to the emitting device ED.

The driving transistor DT can include the first node N1, the second nodeN2, a third node N3, and the like.

The first node N1 of the driving transistor DT is a node correspondingto a gate node, and can be electrically connected to a source node or adrain node of the first transistor T1. The second node N2 of the drivingtransistor DT can be electrically connected to the first electrode E1 ofthe emitting device ED, and can be a source node or a drain node. Thethird node N3 of the driving transistor DT is a node to which a drivingvoltage EVDD is applied. The third node N3 can be electrically connectedto a driving voltage line DVL, through which the driving voltage EVDD issupplied, and be a drain node or a source node.

Hereinafter, in the description of the driving transistor DT, the firstnode N1 will be regarded as a gate node, the second node N2 will beregarded as a source node, and the third node N3 will be regarded as adrain node for the sake of brevity.

The first transistor T1 can control the on/off state of the drivingtransistor DT, and can serve to deliver a video data signal Vdata to thefirst node N1 of the driving transistor DT.

The drain node or source node of the first transistor T1 can beelectrically connected to a corresponding data line DL, the source nodeor drain node of the first transistor T1 can be electrically connectedto the first node N1 of the driving transistor DT, and the gate node ofthe first transistor T1 can be electrically connected to a correspondinggate line to receive a scan signal SCAN.

The first transistor T1 can be on/off controlled by the scan signal SCANapplied to the gate node through a corresponding gate line. Herein, thescan signal SCAN is a type of gate signal.

The first transistor T1 can be turned on by the scan signal SCAN todeliver the video data signal Vdata, supplied through the correspondingdata line DL, to the first node N1 of the driving transistor DT.

The storage capacitor Cst can be electrically connected to the firstnode N1 and the second node N2 of the driving transistor DT and maintainthe video data signal Vdata corresponding to a video signal voltage or avoltage corresponding thereto during a one-frame time.

The storage capacitor Cst can include a first plate PLT1 and a secondplate PLT2 spaced apart from each other. An insulating layer (i.e., adielectric layer) can be situated between the first plate PLT1 and thesecond plate PLT2.

As described above, the single subpixel SP illustrated in FIG. 2 canhave a 2T1C (i.e., 2 transistors and 1 capacitor) structure includingtwo transistors DT and T1 and a single storage capacitor Cst to drivethe emitting device ED.

The subpixel structure (i.e., 2T1C structure) illustrated in FIG. 2 ismerely an example provided for the sake of explanation. The singlesubpixel SP can further include one or more transistors or one or morecapacitors, depending on the function, panel structure, or the like.

For example, as illustrated in FIG. 3 , the single subpixel SP can havea 3T1C (i.e., 3 transistors and 1 capacitor) structure further includinga second transistor T2 electrically connected to the second node N2 ofthe driving transistor DT and a reference voltage line RVL.

Referring to FIG. 3 , the second transistor T2 can be electricallyconnected to the second node N2 of the driving transistor DT and thereference voltage line RVL to be on/off controlled by a sense signalSENSE applied to the gate node.

More specifically, the drain node or the source node of the secondtransistor T2 can be electrically connected to the reference voltageline RVL, while the source node or the drain node of the secondtransistor T2 can be electrically connected to the second node N2 of thedriving transistor DT. The gate node of the second transistor T2 can beelectrically connected to the corresponding gate line GL to receive thesense signal SENSE. Herein, the sense signal SENSE is a type of gatesignal.

For example, the second transistor T2 can be turned on in a displaydriving time segment, or can be turned on in a sensing driving timesegment in which characteristics of the driving transistor DT orcharacteristics of the emitting device ED are sensed.

The second transistor T2 can be turned on by the sense signal SENSE at acorresponding driving time (e.g., a display driving time or a voltageinitialization time of the second node N2 of the driving transistor DTwithin the sensing driving time segment) to deliver a reference voltageVref, supplied through the reference voltage line RVL, to the secondnode N2 of the driving transistor DT.

In addition, the second transistor T2 can be turned on by the sensesignal SENSE at a corresponding driving time (e.g., a sampling timewithin the sensing driving time segment) to deliver a voltage of thesecond node N2 of the driving transistor DT to the reference voltageline RVL.

For example, the second transistor T2 can control the voltage state ofthe second node N2 of the driving transistor DT or deliver the voltageof the second node N2 of the driving transistor DT to the referencevoltage line RVL.

Here, the reference voltage line RVL can be electrically connected to ananalog-to-digital converter (ADC) that senses a voltage of the referencevoltage line RVL, converts the sensed voltage into a digital value, andoutputs sensing data including the digital value.

The analog-to-digital converter can be included within each of the SDICsof which the data driver 120 is constituted.

The sensing data output from the analog-to-digital converter can be usedto sense characteristics (e.g., a threshold voltage or mobility) of thedriving transistor DT or characteristics (e.g., a threshold voltage) ofthe emitting device ED.

In addition, the storage capacitor Cst can be an external capacitorintentionally designed to be disposed externally of the drivingtransistor DT, rather than a parasitic capacitor (e.g., Cgs or Cgd),i.e., an internal capacitor present between the first node N1 and thesecond node N2 of the driving transistor DT.

Each of the driving transistor DT, the first transistor T1, and thesecond transistor T2 can be an N-type transistor or a P-type transistor.

In addition, the scan signal SCAN and the sense signal SENSE can beseparate gate signals. In this case, the scan signal SCAN and the sensesignal SENSE can be applied to the gate node of the first transistor T1and the gate node of the second transistor T2 through different gatelines.

In some cases, the scan signal SCAN and the sense signal SENSE can bethe same gate signal. In this case, the scan signal SCAN and the sensesignal SENSE can be commonly applied to the gate node of the firsttransistor T1 and the gate node of the second transistor T2 through asingle gate line.

The subpixel structures illustrated in FIGS. 2 and 3 are merely examplesprovided for the sake of explanation. Each of the subpixel structurescan further include one or more transistors, or in some cases, one ormore capacitors. Each of the plurality of subpixels can have the samestructure, or some of the plurality of subpixels can have a differentstructure.

Hereinafter, each of the subpixels SP disposed in the display panel 110will be described as being designed as the 3T1C structure illustrated inFIG. 3 for the sake of brevity.

First, the driving operation of each of the subpixels SP will be brieflydescribed as an example.

The driving operation of each of the subpixels SP can include video datawriting, boosting, and emission operations.

In the video data writing operation, the corresponding video data signalVdata can be applied to the first node N1 of the driving transistor DT,and the reference voltage Vref can be applied to the second node N2 ofthe driving transistor DT. Here, due to resistance components betweenthe second node N2 of the driving transistor DT and the referencevoltage line RVL, when the reference voltage Vref is applied to thereference voltage line RVL, a voltage actually applied to the secondnode N2 of the driving transistor DT can be the reference voltage Vrefor be slightly different from the reference voltage Vref.

In the video data writing operation, the first transistor T1 and thesecond transistor T2 can be turned on simultaneously or with aninsignificant time difference by a turn-on voltage level of each of thescan signal SCAN and the sense signal SENSE.

In the video data writing operation, the storage capacitor Cst can becharged with an electric charge corresponding to a potential differencebetween two ends Vdata-Vref.

The application of the video data signal Vdata to the first node N1 ofthe driving transistor DT is referred to as video data writing.

In the boosting operation following the video data writing operation,the first node N1 and the second node N2 of the driving transistor DTcan be electrically floated simultaneously or with an insignificant timedifference therebetween.

In this regard, the first transistor T1 can be turned off by a turn-offvoltage level of the scan signal SCAN. In addition, the secondtransistor T2 can be turned off by a turn-off voltage level of the sensesignal SENSE.

In the boosting operation, the voltage of each of the first node N1 andthe second node N2 of the driving transistor DT can be boosted while thevoltage difference between the first node N1 and the second node N2 ofthe driving transistor DT is maintained.

When the boosted voltage of the second node N2 of the driving transistorDT reaches a predetermined voltage level or higher through the boostingof the voltages of the first node N1 and the second node N2 of thedriving transistor DT during the boosting operation, the emissionoperation starts.

In this emission operation, a driving current can flow to the emittingdevice ED, so that the emitting device ED emits light.

FIG. 4 is a diagram illustrating an arrangement of subpixels SP1, SP2,SP3, and SP4 and signal lines DL1 to DL4, RVL, DVL, GLa, and GLb in thedisplay device 100 according to one or more embodiments.

FIG. 4 is a plan view illustrating an area of the display panel 110, inwhich four subpixels SP1, SP2, SP3, and SP4 respectively having thesubpixel structure illustrated in FIG. 3 are arrayed.

In FIG. 4 , the four subpixels SP1, SP2, SP3, and SP4 are subpixelsarrayed in a single r ow.

Referring to FIG. 4 , in the area in which the four subpixels SP1, SP2,SP3, and SP4 are arrayed, one or more gate lines GLa and GLb can bedisposed to extend in a row direction.

In FIG. 4 , the two gate lines GLa and GLb are disposed to extend in therow direction in the area in which the four subpixels SP1, SP2, SP3, andSP4 are arrayed, in consideration of a case in which the scan signalSCAN applied to the gate node of the first transistor T1 and the sensesignal SENSE applied to the gate node of the second transistor T2 areindependent of each other in each of the subpixels SP1, SP2, SP3, andSP4, as described above.

In each of the subpixels SP1, SP2, SP3, and SP4, in a case in which thescan signal SCAN applied to the gate node of the first transistor T1 isthe same as the sense signal SENSE applied to the gate node of thesecond transistor T2, a single gate line GLa or GLb can extend in therow direction in the area in which the four subpixels SP1, SP2, SP3, andSP4 are arrayed.

Referring to FIG. 4 , in the area in which the four subpixels SP1, SP2,SP3, and SP4 are arrayed, four data lines DL1 to DL4 can extend in acolumn direction.

The four data lines DL1 to DL4 can supply corresponding video datasignals Vdata1 to Vdata4 to the four subpixels SP1, SP2, SP3, and SP4.

Referring to FIG. 4 , in the area in which the four subpixels SP1, SP2,SP3, and SP4 are disposed, driving voltage lines DVL can extend in thecolumn direction.

A single driving voltage line DVL can be disposed for each column ofsubpixels.

In some cases, a single driving voltage line DVL can be disposed for twoor more columns of subpixels. For example, the single driving voltageline DVL can be shared by the two or more columns of subpixels.Referring to the illustration of FIG. 4 , a single driving voltage lineDVL is disposed for every two columns of subpixels.

The left driving voltage line DVL (the left driving voltage line DVL inFIG. 4 ) can supply a driving voltage EVDD to the first subpixel SP1 andthe second subpixel SP2. For example, the left driving voltage line DVLcan be directly connected to one of the first subpixel SP1 and thesecond subpixel SP2 while being connected to the remaining one via aconnecting pattern Cpd.

The right driving voltage line DVL (the right driving voltage line DVLin FIG. 4 ) can supply the driving voltage EVDD to the third subpixelSP3 and the fourth subpixel SP4. For example, the right driving voltageline DVL can be directly connected to one of the third subpixel SP3 andthe fourth subpixel SP4 while being connected to the remaining one via aconnecting pattern Cpd.

Referring to FIG. 4 , in the area in which the four subpixels SP1, SP2,SP3, and SP4 are arrayed, the reference voltage line RVL can extend inthe column direction.

A single reference voltage line RVL can be disposed for a single columnof subpixels.

In some cases, a single reference voltage line RVL can be disposed fortwo or more columns of subpixels. For example, the single referencevoltage line RVL can be shared by the two or more columns of subpixels.

Referring to the illustration of FIG. 4 , a single reference voltageline RVL is disposed for every four columns of subpixels.

Thus, the reference voltage line RVL can supply the reference voltageVref to the first to fourth subpixels SP1 to SP4. The reference voltageline RVL can be connected to one or more subpixels among the first tofourth subpixels SP1 to SP4 via a connecting pattern CPr.

As described above, since various types of signal lines DL1 to DL4, DVL,and RVL respectively extend in the column direction, for example, thefirst data line DL1 and the second data line DL2 among the four datalines DL1 to DL4 can extend between the first subpixel SP1 and thesecond subpixel SP2 in order to improve the aperture ratio of thedisplay panel 110 and the regularity of the arrangement of the lines.The third data line DL3 and the fourth data line DL4 among the four datalines DL1 to DL4 can extend between the third subpixel SP3 and thefourth subpixel SP4.

FIG. 5 is a diagram illustrating a planar structure of each of thesubpixels in the display device according to one or more embodiments.

FIG. 5 is a plan view illustrating the planar structure of each of thesubpixels SP having the 3T1C structure as illustrated in FIG. 3 .

Referring to FIG. 5 , three transistors DT, T1, and T2, a single storagecapacitor Cst, and a single first electrode E1 can be disposed in thearea of each of the subpixels SP.

Referring to FIG. 5 , in the area of each of the subpixels SP, the size,position, shape, or the like of each of the three transistors DT, T1,and T2, the single storage capacitor Cst, and the single first electrodeE1 can be variously designed.

Referring to FIG. 5 , the positions or the like of the signal lines DL,DVL, GLa, and GLb passing through the areas of the subpixels SP can bevariously designed.

Referring to FIG. 5 , in the area of each of the subpixels SP, the firstplate PLT1 and the second plate PLT2 of the single storage capacitor Cstcan correspond to the first node N1 and the second node N2 of thedriving transistor DT.

In addition, the display device 100 according to embodiments can providenot only a display function but also a touch sensing function to detecta touch made by a touch object (e.g., a finger or a pen) of a user.

In a case in which the touch object has touched the screen, the displaydevice 100 according to embodiments can detect the touch. In this case,the display device 100 can be regarded as providing contact touchsensing. Alternatively, even in a case in which the touch object has notcontacted the screen, the display device 100 can detect a touch when thetouch object is close to the screen. In this case, the display device100 can be regarded as providing non-contact touch sensing, and thistouch sensing mode can be referred to as a hovering mode or a gesturemode.

Hereinafter, the touch object will be described as being a finger forthe sake of brevity.

A typical display device is separately provided with a touchscreen panelincluding touch electrodes corresponding to touch sensors to provide atouch sensing function. For example, a typical display device includesboth a display panel and a touchscreen panel. In this case, the size(thickness) of the display device is inevitably increased.

In addition, a typical display device further includes a touch driver todrive the touchscreen panel and perform a sensing operation.Accordingly, since the typical display device should further include adisplay driver to drive the display panel and the touch driver to drivethe touchscreen panel, the number of components is increased, and asignificant degree of difficulty related to circuit connection iscaused.

In contrast, the display device 100 according to embodiments does notinclude a separate touchscreen panel. Instead, the display panel 110included in the display device 100 according to embodiments also servesas a touchscreen panel.

In particular, in the display device 100 according to embodiments, forthe display panel 110 to serve as the touchscreen panel, none of theelectrodes, signal lines, and other touch sensors (i.e., touchelectrodes) necessary for touch driving are disposed inside of thedisplay panel 110.

The display device 100 according to embodiments performs the touchsensing using the structure that has been present in the display panel110 for the display driving.

In addition, the display device 100 according to embodiments to bedescribed below does not include the separate touch driver for the touchsensing. The display driver included in the display device 100 accordingto embodiments also serves as the touch driver.

Meanwhile, the typical display device performs the display driving andthe touch driving separately in different time fractions. In contrast,the display device 100 according to embodiments can simultaneouslyperform the display driving and the touch driving.

The display device 100 according to embodiments can supply the videodata signal to each of the plurality of data lines DL and detect a touchand determine touch coordinates on the basis of a signal sensed througheach of the plurality of data lines in response to the video data signalsupplied to the plurality of data lines DL.

Hereinafter, a structure and method by which the display device 100according to embodiments provides the touch sensing function will bedescribed in more detail.

FIG. 6 is a diagram illustrating a structure and method by which thedisplay device 100 according to one or more embodiments cansimultaneously perform the display driving and the touch sensing.

Hereinafter, for the sake of brevity, the scan signal SCAN and the sensesignal SENSE applied to the gate node of the first transistor T1 and thegate node of the second transistor T2, respectively, in each of thesubpixels SP will be assumed to be the same signal, i.e., a gate signalGATE. According to this assumption, a single gate line GL is disposed ina single row of subpixels. In addition, for the sake of brevity, thereference voltage line RVL can be omitted from the drawings.

Referring to FIG. 6 , the display device 100 according to embodimentscan include a display panel 110 in which the plurality of data lines DLand the plurality of gate lines GL are disposed and the plurality ofsubpixels SP are arrayed; the gate driver 130 supplying the gate signalGATE to each of the plurality of gate lines GL; the data driver (or datadriving circuit) 120 supplying the video data signal Vdata, including afirst signal segment S1 and a second signal segment S2 maintaining apredetermined voltage difference, to each of the plurality of data linesDL and outputting readout data in response to signal sensing througheach of the plurality of data lines DL to which the video data signalVdata is supplied; a touch controller 600 detecting a touch ordetermining touch coordinates on the basis of the readout data; and thelike.

In the display device 100 according to embodiments, the video datasignal Vdata supplied to each of the plurality of data lines DL not onlybasically functions as a signal for the image display but also functionsas a touch driving signal for the touch sensing.

In this regard, the video data signal Vdata supplied to each of theplurality of data lines DL can include the first signal segment S1 andthe second signal segment S2 maintaining a predetermined voltagedifference ΔV.

In the display device 100 according to embodiments, the plurality ofdata lines DL can serve not only as signal lines for the display drivingbut also as signal lines for the touch driving.

In the display device 100 according to embodiments, the video datasignal Vdata supplied to the data line DL can be input to the subpixelsSP arrayed along the gate line GL through which the gate signal GATEhaving a turn-on level voltage is applied in response to gate scanning.

Consequently, the video data signal Vdata supplied to the data line DLcan be delivered to the first node N1 of the driving transistor DTthrough the turned-on first transistor T1 in the corresponding subpixelsSP.

The video data signal Vdata delivered to the first node N1 of thedriving transistor DT is applied to the first plate PLT1 of the storagecapacitor Cst.

The video data signal Vdata applied to the first plate PLT1 of thestorage capacitor Cst can generate image display capacitance (i.e.,capacitance for image display) together with the reference voltage Vrefapplied to the second plate PLT2 of the storage capacitor Cst.

For example, in a case in which the display device 100 performs theself-capacitance-based touch sensing, the video data signal Vdataapplied to the first plate PLT1 of the storage capacitor Cst cangenerate touch sensing capacitance Cfinger (i.e., capacitance for touchsensing) together with a finger while generating the image displaycapacitance.

Accordingly, in the display device 100 according to embodiments, thefirst plate PLT1 of the storage capacitor Cst present in each of thesubpixels SP serves as a touch electrode (or touch sensor).

The video data signal Vdata applied to the first plate PLT1 of thestorage capacitor Cst includes the first signal segment S1 and thesecond signal segment S2 maintaining the predetermined voltagedifference ΔV, so that the first plate PLT1 of the storage capacitor Cstserves as the touch electrode.

The video data signal Vdata can include the first signal segment S1 andthe second signal segment S2 for a set time tS. Here, the set time tScan correspond to a period for which the corresponding gate line GL hasa turn-on voltage level. The set time tS can be a one-horizontal time1H, a two-horizontal time 2H, or the like, or in some cases, can be aperiod (e.g., 1.6H) that is a real number times the one-horizontal time.

The voltage value of the second signal segment S2 of the video datasignal Vdata supplied to each of the plurality of data lines DLcorresponds to a substantial voltage value for the image display. Thus,the voltage value of the second signal segment S2 of the video datasignal Vdata, supplied to each of the plurality of data lines DL, is avoltage value that can change in response to changes in a video frame.

However, the voltage difference ΔV between the first signal segment S1and the second signal segment S2 of the video data signal Vdata,supplied to each of the plurality of data lines DL, is a voltage changefor the touch sensing. The voltage difference ΔV is a value that shouldbe maintained at a predetermined level for touch sensitivity.

The voltage value of the first signal segment S1 of the video datasignal Vdata, supplied to each of the plurality of data lines DL,corresponds to a voltage value obtained by subtracting the voltagedifference ΔV from the voltage value of the second signal segment S2 inorder to produce the voltage difference ΔV necessary for the touchsensing.

As described above, even in a case in which the voltage value of each ofthe first signal segment S1 and the second signal segment S2 of thevideo data signal Vdata, supplied to each of the plurality of data linesDL, changes, the voltage difference ΔV between the first signal segmentS1 and the second signal segment S2 can be maintained to be constant.

The first signal segment S1 of the video data signal Vdata has a voltagevalue by which the voltage difference ΔV between the first signalsegment S1 and the second signal segment S2 is maintained to beconstant, even in a case in which the voltage value of the second signalsegment S2 has a random characteristic. In this aspect, the first signalsegment S1 of the video data signal Vdata can be referred to as voltagemaking signal segment or a reset signal segment.

Accordingly, the voltage value of the first signal segment S1 of thevideo data signal Vdata also has a random characteristic, like thevoltage value of the second signal segment S2.

Since the video data signal Vdata has the above-described signalcharacteristics, the video data signal Vdata functions as the displaydriving signal for the image display while functioning as the touchdriving signal for the touch driving.

Accordingly, the display device 100 according to embodiments can performthe touch sensing by performing both the display driving and the touchdriving by directly using the existing subpixels SP.

FIG. 7 is a diagram illustrating an arrangement of the subpixels SP, thedata lines DL, the gate lines GL, and the storage capacitors Cst forexplaining a simultaneous driving structure and a simultaneous drivingmethod of the display device 100 according to embodiments.

FIG. 7 illustrates a panel structure for explaining the simultaneousdriving structure and the simultaneous driving method by which thedisplay device 100 according to one or more embodiments simultaneouslyprovides the display driving and the touch driving using the subpixelsSP.

Referring to FIG. 7 , a first gate line GL1 corresponding to a first rowof subpixels delivers a first gate signal GATE1 to subpixels SP11, SP12,SP13, SP14, and . . . arrayed in the first row of subpixels. A secondgate line GL2 corresponding to a second row of subpixels delivers asecond gate signal GATE2 to subpixels SP21, SP22, SP23, SP24, and . . .arrayed in the second row of subpixels. A third gate line GL3corresponding to a third row of subpixels delivers a third gate signalGATE3 to subpixels SP31, SP32, SP33, SP34, and . . . arrayed in thethird row of subpixels.

Referring to FIG. 7 , the subpixels SP11, SP21, SP31, and . . . arrayedin a first column of subpixels can sequentially receive a correspondingfirst video data signal Vdata1 through the first data line DL1corresponding to the first column of subpixels, at corresponding times.The subpixels SP12, SP22, SP32, and . . . arrayed in a second column ofsubpixels can sequentially receive a corresponding second video datasignal Vdata2 through the second data line DL2 corresponding to thesecond column of subpixels, at corresponding times. The subpixels SP13,SP23, SP33, and . . . arrayed in a third column of subpixels cansequentially receive a third video data signal Vdata3 through the thirddata line DL3 corresponding to the third column of subpixels, atcorresponding times. The subpixels SP14, SP24, SP34, and . . . arrayedin a fourth column of subpixels can sequentially receive a fourth videodata signal Vdata4 through the fourth data line DL4 corresponding to thefourth column of subpixels, at corresponding times.

Referring to FIG. 7 , the storage capacitor Cst including the firstplate PLT1 and the second plate PLT2 can be disposed in each area of allof the subpixels SP11, SP12, and . . . .

Referring to FIG. 7 , the first plate PLT1 in the first plate PLT1 andthe second plate PLT2 of the storage capacitor Cst is electricallyconnected to the first node N1 of the driving transistor DT. The secondplate PLT2 of the storage capacitor Cst is electrically connected to thesecond node N2 of the driving transistor DT.

Accordingly, the corresponding video data signal Vdata including thefirst signal segment S1 and the second signal segment S2 can be appliedto the first plate PLT1 of the storage capacitor Cst.

FIG. 8 is a gate driving timing diagram in case of simultaneous drivingof the display device 100 according to embodiments.

Referring to FIG. 8 , in case of the simultaneous driving of the displaydevice 100 according to embodiments, each of the gate signals GATE1,GATE2, GATE3, and . . . applied to the plurality of gate lines GL1, GL2,GL3, and . . . , respectively, can include a signal segment having aturn-on voltage level LEV_ON and a signal segment having a turn-offvoltage level LEV_OFF.

In the gate signals GATE1, GATE2, GATE3, and . . . applied to theplurality of gate lines GL1, GL2, GL3, and . . . , the signal segmentshaving the turn-on voltage level LEV_ON can be located at predeterminedgate driving times.

For example, in each of the signal segments of the gate signals GATE1,GATE2, GATE3, and . . . , having the turn-on voltage level LEV_ON, thetemporal length can be a one-horizontal time 1H, a two-horizontal time2H, or the like, and in some cases, can be a period (e.g., 1.6H) that isa real number times the one-horizontal time.

Referring to FIG. 8 , in each of the gate signals GATE1, GATE2, GATE3,and . . . , the signal segments having the turn-on voltage level LEV_ONmay not overlap each other.

In some cases, in each of the gate signals GATE1, GATE2, GATE3, and . .. , the signal segments having the turn-on voltage level LEV_ON canoverlap each other.

FIG. 9 is a diagram illustrating the first video data signal Vdata1supplied to the first data line DL1 and the second video data signalVdata2 supplied to the second data line DL2 in case of the simultaneousdriving of the display device 100 according to embodiments.

Referring to FIG. 9 , an actual voltage value of the video data signalVdata (i.e., a voltage value of the second signal segment S2) expressinga gray level for the image display can have a random characteristic fromthe perspective of the display panel 110.

For example, the voltage value of the second signal segment S2 of thefirst video data signal Vdata1, supplied to the first data line DL1among the plurality of data lines DL disposed in the display panel 110,and the voltage value of the second signal segment S2 of the secondvideo data signal Vdata2, supplied to the second data line DL2 among theplurality of data lines DL, can be the same or different from eachother.

However, the voltage difference ΔV between the first signal segment S1and the second signal segment S2 of the first video data signal Vdata1,supplied to the first data line DL1 among the plurality of data lines DLdisposed in the display panel 110, and the voltage difference ΔV betweenthe first signal segment S1 and the second signal segment S2 of thesecond video data signal Vdata2, supplied to the second data line DL2among the plurality of data lines DL, can correspond to each other.

For example, the voltage difference ΔV between the first signal segmentS1 and the second signal segment S2 of the first video data signalVdata1 supplied to the first data line DL1 and the voltage difference ΔVbetween the first signal segment S1 and the second signal segment S2 ofthe second video data signal Vdata2 supplied to the second data line DL2can be the same.

Even in a case in which the voltage value of the second signal segmentS2 of each of the first video data signal Vdata and the second videodata signal Vdata2 has a random characteristic, the first signal segmentS1 of each of the first video data signal Vdata and the second videodata signal Vdata2 has a voltage value causing the voltage difference ΔVbetween the first signal segment S1 and the second signal segment S2 ofthe first video data signal Vdata1 supplied to the first data line DL1and the voltage difference ΔV between the first signal segment S1 andthe second signal segment S2 of the second video data signal Vdata2supplied to the second data line DL2 to be the same.

Accordingly, the voltage value of the first signal segment S1 of each ofthe first video data signal Vdata1 and the second video data signalVdata2 is also a random voltage value.

In this sense, the first signal segment S1 of each of the first videodata signal Vdata and the second video data signal Vdata2 can bereferred to as a voltage making signal segment or a reset signalsegment.

FIG. 10 is a diagram illustrating the first video data signal Vdata1supplied to the first data line DL1 with the elapse of the driving timein case of the simultaneous driving of the display device 100 accordingto embodiments.

Referring to FIG. 10 , even in a case in which the voltage value of thesecond signal segment S2 of the first video data signal Vdata1 suppliedthrough the first data line DL1 changes with the change of the drivingtime (i.e., changes in the subpixels SP to which the video data signalis supplied), the voltage difference ΔV between the first signal segmentS1 and the second signal segment S2 of the first video data signalVdata1 is maintained to be constant.

To maintain the voltage difference ΔV between the first signal segmentS1 and the second signal segment S2 of the first video data signalVdata1 to be constant, the voltage value of the first signal segment S1of the first video data signal Vdata1 changes with the change of thedriving time.

Even in a case in which the voltage value of the second signal segmentS2 of the second video data signal Vdata2 supplied through the seconddata line DL2 changes, the voltage difference ΔV between the firstsignal segment S1 and the second signal segment S2 of the second videodata signal Vdata2 is maintained to be constant.

To maintain the voltage difference ΔV between the first signal segmentS1 and the second signal segment S2 of the second video data signalVdata2 is maintained to be constant, the voltage value of the firstsignal segment S1 of the second video data signal Vdata2 changes withthe change of the driving time.

In addition, even in a case in which the voltage value of the secondsignal segment S2 of the first video data signal Vdata1 and the voltagevalue of the second signal segment S2 of the second video data signalVdata2 change with the change of the driving time, the voltagedifference ΔV between the first signal segment S1 and the second signalsegment S2 of the first video data signal Vdata1 and the voltagedifference ΔV between the first signal segment S1 and the second signalsegment S2 of the second video data signal Vdata2 can correspond to eachother or the same.

FIG. 11 is a diagram illustrating a configuration of the data driver 120of the display device 100 according to one or more embodiments.

Referring to FIG. 11 , the data driver 120 of the display device 100according to embodiments can include a latch circuit 1110, adigital-to-analog converting circuit 1120, a simultaneous drivingcircuit 1130, and the like. The latch circuit 1110 stores the videodata. The digital-to-analog converting circuit 1120 converts the videodata into an analog video signal in the form of an analog voltage. Thesimultaneous driving circuit 1130 supplies the video data signal Vdata,including the first signal segment S1 and the second signal segment S2maintaining the predetermined voltage difference ΔV on the basis of theanalog video signal, to each of the plurality of data lines DL, andoutputs the readout data in response to signal sensing through each ofthe plurality of data lines DL to which the video data signal Vdata issupplied.

The latch circuit 1110 can include one or more latches for each of theplurality of data lines DL.

The digital-to-analog converting circuit 1120 can include a plurality ofdigital-to-analog converters (DACs).

FIG. 12 is a diagram illustrating the simultaneous driving circuit 1130in the data driver 120 of the display device 100 according toembodiments.

Referring to FIG. 12 , the data driver 120 can include a simultaneousdriving circuit 1130 driving a plurality of data lines DL1, DL2, and . .. for the display driving and sensing the plurality of data lines DL1,DL2, and . . . for the touch sensing.

Referring to FIG. 12 , the simultaneous driving circuit 1130 can includea plurality of simultaneous driving amplifiers SDAMP supplying the videodata signal Vdata to the plurality of data lines DL1, DL2, and . . . andperforming sensing on the plurality of data lines DL1, DL2, and . . . .

For example, each of the plurality of simultaneous driving amplifiersSDAMP can be implemented as a charge amplifier, a current conveyor, asigma-delta modulator, or the like. Hereinafter, for the sake ofbrevity, each of the plurality of simultaneous driving amplifiers SDAMPwill be described as being implemented as a charge amplifier.

Each of the plurality of simultaneous driving amplifiers SDAMP caninclude an operation amplifier OP-AMP, a feedback capacitor Cfb, and thelike.

The operation amplifier OP-AMP included in each of the plurality ofsimultaneous driving amplifiers SDAMP can include a first input port IN1through which the corresponding video data signal Vdata is input; asecond input port IN2 connected to the corresponding data line DL tooutput the video data signal Vdata, input through the first input portIN1, to the corresponding data line DL; an output port OUT outputting asensing signal SS sensed through the corresponding data line DL; and thelike.

The feedback capacitor Cfb can be electrically connected to the secondinput port IN2 and the output port OUT of the operation amplifierOP-AMP.

The amount of electric charge stored in the feedback capacitor Cfb canvary depending on the presence/absence, position, or the like of thetouch object close to the corresponding storage capacitor Cst, therebychanging the sensing signal SS output from the output port OUT of theoperation amplifier OP-AMP.

FIG. 13 is a diagram illustrating a structure of connecting the firstplate PLT1 of the storage capacitor Cst and a channel shield pattern toimprove touch sensitivity of the display device 100 according toembodiments.

Referring to FIG. 13 , the entirety or a portion of the plurality ofsubpixels SP can include a channel shield pattern CHSHD overlapping witha channel area of the driving transistor DT.

The channel shield pattern CHSHD is a pattern protecting the channel ofthe driving transistor DT.

For example, the channel shield pattern CHSHD can prevent a channel ofthe driving transistor DT, which is vulnerable to light, from beingirradiated with light. Thus, the channel shield pattern CHSHD is alsoreferred to as a light shield.

The channel shield pattern CHSHD can be electrically connected to thefirst plate PLT1 of the storage capacitor Cst.

As described above, the channel shield pattern CHSHD being electricallyconnected to the first plate PLT1 of storage capacitor Cst can increasethe area of the electrode to which the video data signal Vdata isapplied. Accordingly, the touch sensitivity can be improved.

FIG. 14 is a diagram illustrating components, such as a shield line SHDLfor shielding the data line DL and a shield driver 1400, for improvingtouch sensitivity in the display device 100 according to embodiments,FIG. 15 is a diagram illustrating a structure of the shield line SHDLfor improving touch sensitivity in the display device 100 according toembodiments, and FIG. 16 is a diagram illustrating a shield drivingsignal SDS supplied to the shield line SHDL for improving touchsensitivity in the display device 100 according to embodiments.

Referring to FIG. 14 , the display panel 110 can further include aplurality of shield lines SHDL corresponding to the plurality of datalines DL.

The plurality of shield line SHDL can shield the plurality of data linesDL and surrounding conductors located around the plurality of data linesDL.

Here, a surrounding conductor corresponding to one of the data lines DLcan be, for example, a gate line GL, another data line DL, or the like,disposed around the corresponding data line DL, or can be any electrodeor line having an electrical state different from the video data signalVdata applied to the corresponding data line DL.

Referring to FIG. 15 , a single shield line SHDL can be disposed alongand around a corresponding single data line DL. The shield line SHDL caninclude one or more among a first metal M1 located below thecorresponding data line DL, a second metal M2 located next to thecorresponding data line DL, and a third metal M3 located above thecorresponding data line DL.

Referring to FIG. 14 , the simultaneous driving circuit 1130 can furtherinclude the shield driver 1400 electrically connected to the pluralityof shield lines.

Referring to FIG. 14 , the shield driver 1400 can supply the shielddriving signal SDS to each of the plurality of shield line SHDL.

Referring to FIG. 14 , the shield driver 1400 can include an outputbuffer BUF including a buffer input port INb through which the shielddriving signal SDS is input and a buffer output port OUTb electricallyconnected to the shield line SHDL. The output buffer BUF can be presentfor every data line DL.

Alternatively, the shield driver 1400 can be provided in the form of aconducting line, through which the shield driving signal SDS input tothe simultaneous driving amplifier SDAMP is delivered to the shield lineSHDL.

Referring to FIG. 16 , the shield driving signal SDS supplied to each ofthe plurality of shield lines SHDL can correspond to the video datasignal Vdata supplied to the corresponding data line DL.

Referring to FIG. 16 , the shield driving signal SDS supplied to each ofthe plurality of shield line SHDL corresponds to the video data signalVdata supplied to the corresponding data line DL. This means that theamplitude, phase, frequency, or the like of the shield driving signalSDS corresponds to that of the video data signal Vdata.

In particular, the amplitude, phase, frequency, or the like of theshield driving signal SDS supplied to each of the plurality of shieldline SHDL can correspond to that of the second signal segment S2 of thevideo data signal Vdata supplied to the corresponding data line DL.

Referring to FIG. 16 , for example, the shield driving signal SDSsupplied to the first shield line among the plurality of shield linesSHDL, corresponding to the first data line DL1, can include a segment,the voltage level of which changes by an amplitude corresponding to thevoltage difference ΔV between the first signal segment S1 and the secondsignal segment S2 of the video data signal Vdata supplied to the firstdata line DL1.

For example, the shield driving signal SDS supplied to each of theplurality of shield line SHDL can be the same as the video data signalVdata supplied to the corresponding data line DL.

As described above, during the touch driving, the occurrence ofunnecessary parasitic capacitance between the data line DL and thesurrounding conductors can be prevented, thereby improving touchsensitivity.

In addition, in the display device 100 according to one or moreembodiments, the gate signal GATE supplied to the plurality of gatelines GL can include a segment, the voltage level of which changes by anamplitude corresponding to the voltage difference ΔV between the firstsignal segment S1 and the second signal segment S2 of the video datasignal Vdata.

For example, the gate signal GATE can have a signal waveform serving asa voltage change of the first signal segment S1 and the second signalsegment S2 of the video data signal Vdata applied to the correspondingdata line DL, on the basis of a basic signal waveform including a signalsegment having the turn-on voltage level LEV_ON and a signal segmenthaving the turn-off voltage level LEV_OFF.

As described above, during the touch driving, the occurrence ofunnecessary parasitic capacitance between the data line DL and the gateline GL can be prevented, thereby improving touch sensitivity.

FIG. 17 is a diagram illustrating the simultaneous driving circuit 1130for accurate display driving in case of simultaneous driving of thedisplay device 100 according to one or more embodiments, and FIG. 18 isa diagram illustrating the video data signal Vdata output by two drivingelements (i.e., the simultaneous driving amplifier SDAMP and the outputbuffer BUF) included in the simultaneous driving circuit 1130 foraccurate display driving in case of simultaneous driving of the displaydevice 100 according to embodiments.

Referring to FIG. 17 , the simultaneous driving circuit 1130 can furtherinclude a plurality of output buffers BUF for supplying the video datasignal Vdata to the plurality of data lines DL.

Each of the plurality of output buffer BUF can include the buffer inputport INb, through which the video data signal Vdata is input, and thebuffer output port OUTb electrically connected to the data line DL.

For example, each of the plurality of output buffer BUF can beimplemented as a unit gain buffer (i.e., a unit gain amplifier) tostabilize power of the data line DL.

The data line DL can be electrically connected to the second input portIN2 of the simultaneous driving amplifier SDAMP during a first drivingtiming period t1, and can be electrically connected to the buffer outputport OUTb of the output buffer BUF during a second driving timing periodt2 after the first driving timing period t1.

The simultaneous driving circuit 1130 can further include a drivingswitch element DLSW for selectively connecting one of the output bufferBUF and the simultaneous driving amplifier SDAMP to the data line DLaccording to the driving timing.

The driving switch element DLSW connects the data line DL to the secondinput port IN2 of the simultaneous driving amplifier SDAMP during thefirst driving timing period t1.

The driving switch element DLSW connects the data line DL to the bufferoutput port OUTb of the output buffer BUF during the second drivingtiming period t2.

More specifically, referring to FIGS. 17 and 18 , the driving switchelement DLSW connects the data line DL to a first on-node Non1 or asecond on-node Non2 during a period in which the video data signal Vdatais to be supplied to the data line DL.

In addition, the driving switch element DLSW can connect the data lineDL to an off-node Noff or connect the data line DL to a first on-nodeNon1 for the next supply of a video data signal during a period in whichthe video data signal Vdata is not supplied to the data line DL.

Here, the first on-node Non1 is the second input port IN2 of thesimultaneous driving amplifier SDAMP or a node electrically connected tothe second input port IN2, while the second on-node Non2 is the outputport OUTb of the output buffer BUF or a node electrically connected tothe output port OUTb. The off-node Noff can be in an electricallyfloated state (i.e., a state in which no voltage is applied) or a statein which any control voltage is applied for the touch sensing or thelike.

Referring to FIG. 18 , during a set horizontal time, the video datasignal Vdata can include a first signal segment S1, a second signalsegment S2 continuing from the first signal segment S1, and a thirdsignal segment S3 continuing from the second signal segment S2.

There can be no voltage difference between the second signal segment S2and the third signal segment S3.

In addition, the voltage difference between the second signal segment S2and the third signal segment S3 can be smaller than the voltagedifference ΔV between the first signal segment S1 and the second signalsegment S2.

Referring to FIGS. 17 and 18 , during the first driving timing periodt1, the first signal segment S1 and the second signal segment S2 of thevideo data signal Vdata can be output to the data line DL through thesimultaneous driving amplifiers SDAMP connected to the data line DL bythe driving switch element DLSW.

In this regard, referring to FIG. 18 , the driving switch element DLSWconnects the data line DL to the first on-node Non1 electricallyconnected to the second input port IN2 of the simultaneous drivingamplifiers SDAMP during the first driving timing period t1 of the periodin which the video data signal Vdata is to be supplied to the data lineDL.

Referring to FIGS. 17 and 18 , during the second driving timing periodt2, the third signal segment S3 of the video data signal Vdata can beoutput to the corresponding data line DL through the output buffer BUFconnected to the data line DL by the driving switch element DLSW.

In this regard, referring to FIG. 18 , the driving switch element DLSWconnects the data line DL to the second on-node Non2 electricallyconnected to the output port OUTb of the output buffer BUF during thesecond driving timing period t2 of the period in which the video datasignal Vdata is to be supplied to the data line DL.

Referring to FIG. 18 , after the time periods t1 and t2 in which thevideo data signal Vdata is to be supplied to the data line DL, thedriving switch element DLSW can connect the data line DL to the off-nodeNoff connected to neither the second input port IN2 of the simultaneousdriving amplifier SDAMP nor the output port OUTb of the output bufferBUF.

In addition, after the time periods t1 and t2 in which the video datasignal Vdata is to be supplied to the data line DL, the driving switchelement DLSW can connect the data line DL to the first on-node Non1 forthe next supply of the video data signal.

Referring to FIG. 17 , the output buffer BUF can be included in theshield driver 1400.

In a case in which the simultaneous driving amplifier SDAMP able toperform both the voltage supply to the data line DL and the signalreception from the data line DL is used to simultaneously perform thedisplay driving and the touch driving, the video data signal Vdata forthe display driving may not be reliably supplied to the data line DL.

As described above, when the plurality of output buffer BUF and thedriving using the same are used, the video data signal Vdata for thedisplay driving can be reliably supplied to the data lines DL. Forexample, the display driving can be reliably and accurately performed byusing the plurality of output buffer BUF and the driving using the same.

FIG. 19 is a diagram illustrating an integration sensing process forincreasing touch sensitivity and touch driving efficiency in case ofsimultaneous driving of the display device 100 according to one or moreembodiments.

The area of the storage capacitor Cst serving as a touch electrode (ortouch sensor) in each of the subpixels SP can be insufficient togenerate capacitance Cfinger for the touch sensing.

Accordingly, the display device 100 according to embodiments can providethe integration sensing process to increase touch sensitivity and touchdriving efficiency in the simultaneous driving.

In this regard, the display device 100 according to embodiments canmanage an area of mxn number of subpixels SP defined by m number of gatelines GL (wherein m is a natural number equal to or greater than 2) andn number of data lines DL (where n is a natural number equal to orgreater than 2) as a touch sensor block TSB.

The display device 100 according to embodiments can generate a singlepiece of readout data on the basis of the sensing signals SS sensed fromthe single touch sensor block TSB and perform the touch sensing on thebasis of the readout data.

Describing in terms of driving, during the period in which the gatesignal GATE having the turn-on voltage level is sequentially supplied toeach of the m number of gate lines GL among the plurality of gate linesGL, the simultaneous driving circuit 1130 of the data driver 120 canoutput readout data regarding the single touch sensor block TSBcorresponding to the subpixels SP defined by the m number of gate linesGL and the n number of data lines DL, on the basis of the sensing signalSS sensed through each of then number of data lines DL among theplurality of data lines DL.

Before the application of the above-described integration sensingprocess, a single touch electrode corresponding to a touch sensor can beregarded as the first plate PLT1 of the storage capacitor Cst within asingle subpixel SP.

In contrast, in a case in which the above-described integration sensingprocess is applied, the touch sensor block TSB corresponding to the areaof mxn number of the subpixels SP can be regarded as an enlargement of asingle touch electrode corresponding to a touch sensor. Accordingly, thecapacitance Cfinger for the touch sensing can be increased, therebyimproving touch sensitivity.

The single touch sensor block TSB can be an assembly of storagecapacitor plates (e.g., PLT1) respectively being one of the first platePLT1 and the second plate PLT2 of the storage capacitor Cst included ineach of the subpixels SP defined by the m number of gate lines GL andthe n number of data lines DL.

FIG. 20 is an example diagram illustrating the simultaneous drivingcircuit 1130 performing a first integration sensing process to increasetouch sensitivity and touch driving efficiency in case of simultaneousdriving of the display device 100 according to one or more embodiments.

Referring to FIG. 20 , the first integration sensing process is aprocess of performing integration processing in the level of digitalvalues.

Referring to FIG. 20 , the simultaneous driving circuit 1130 can includea plurality of simultaneous driving amplifiers SDAMP, a plurality ofanalog-to-digital converters ADC, and an integration circuit 2000 toperform the first integration sensing process. The plurality ofsimultaneous driving amplifiers SDAMP supply the video data signal Vdatato the n number of data lines DL among the plurality of data lines DL.The plurality of analog-to-digital converters ADC convert sensingsignals SS1, SS2, . . . , and SSn, sensed through then number of datalines DL among the plurality of data lines DL by the plurality ofsimultaneous driving amplifiers SDAMP, into digital sensing values SD1,SD2, . . . , and SDn. The integration circuit 2000 generates readoutdata regarding the single touch sensor block TSB corresponding to thesubpixels SP defined by the m number of gate lines GL and the n numberof data lines DL by integrating the sensing values SD1, SD2, . . . , andSDn output from the plurality of analog-to-digital converters ADC, andoutputs the readout data.

The simultaneous driving circuit 1130 can further include, for example,at least one of an integrator circuit and a plurality of sample and holdcircuits between the plurality of simultaneous driving amplifiers SDAMPand the plurality of analog-to-digital converter ADC.

According to the first integration sensing process as described above,the integration circuit 2000 of the simultaneous driving circuit 1130can generate a single piece of readout data by performing arithmeticaddition (or summing) on the digital sensing values SD1, SD2, . . . ,and SDn in the level of digital values. Accordingly, the simultaneousdriving circuit 1130 can conveniently perform the integration sensingprocess in the digital level.

FIG. 21 is an example diagram illustrating the simultaneous drivingcircuit 1130 performing a second integration sensing process to increasetouch sensitivity and touch driving efficiency in case of simultaneousdriving of the display device 100 according to one or more embodiments.FIG. 22 is a detailed diagram illustrating the simultaneous drivingcircuit 1130 performing the second integration sensing process toincrease touch sensitivity and touch driving efficiency in case ofsimultaneous driving of the display device 100 according to one or moreembodiments. FIG. 23 is a diagram illustrating the operation timing ofswitch elements SWfb, SWt, and SWint in the simultaneous driving circuit1130.

Referring to FIG. 21 , the second integration sensing process is aprocess of performing the integration processing in the level of analogvoltages.

Referring to FIG. 21 , the simultaneous driving circuit 1130 can includea plurality of simultaneous driving amplifiers SDAMP, an integrationcircuit 2100, and an analog-to-digital converter ADC to perform thesecond integration sensing process. The plurality of simultaneousdriving amplifiers SDAMP supply the video data signal Vdata to the nnumber of data lines DL among the plurality of data lines DL. Theintegration circuit 2100 outputs an integrated sensing signal INTSS byintegrating the sensing signals SS1, SS2, . . . , and SSn sensed throughthe n number of data lines DL among the plurality of data lines DL bythe plurality of simultaneous driving amplifiers SDAMP. Theanalog-to-digital converter ADC outputs readout data based on theintegrated sensing signal INTSS, regarding the single touch sensor blockTSB corresponding to the subpixels SP defined by the m number of gatelines GL and the n number of data lines DL.

The simultaneous driving circuit 1130 can further include, for example,at least one of an integrator circuit and a plurality of sample and holdcircuits between the plurality of simultaneous driving amplifiers SDAMPand the integration circuit 2100.

According to the second integration sensing process as described above,the integration circuit 2100 of the simultaneous driving circuit 1130can generate a single piece of readout data by performing integrationprocessing on the sensing signals SS1, SS2, . . . , and SSn, i.e.,analog voltages, in the level of analog voltages. Accordingly, thesimultaneous driving circuit 1130 can advantageously reduce the numberof the analog-to-digital converters ADC.

Referring to FIG. 22 , the integration circuit 2100 for the secondintegration sensing process can include a plurality of deliverycapacitors C1, C2, . . . , and Cn and an integrator circuit INTAMP. Theplurality of delivery capacitors C1, C2, . . . , and Cn store thesensing signals SS1, SS2, . . . , and SSn, output from the plurality ofsimultaneous driving amplifiers SDAMP, in the form of electric chargesat every set times. The integrator circuit INTAMP cumulatively storesthe sensing signals SS1, SS2, . . . , and SSn stored in the plurality ofdelivery capacitors C1, C2, . . . , and Cn and outputs the integratedsensing signal INTSS.

One end of each of the plurality of delivery capacitors C1, C2, . . . ,and Cn is connected to the output port OUT of each of the plurality ofsimultaneous driving amplifiers SDAMP. The other end of each of theplurality of delivery capacitors C1, C2, . . . , and Cn is connected tothe integrator circuit INTAMP.

The integrator circuit INTAMP includes a non-inversion input port+, aninversion input port −, and the output port OUT, as well as anintegration capacitor Cint connected to the inversion input port − andthe output port OUT.

The non-inversion input port+ of the integrator circuit INTAMP isconnected to a reference voltage node REF. The inversion input port− ofthe integrator circuit INTAMP can be connected to all of the other endsof the plurality of delivery capacitors C1, C2, . . . , and Cn. Theoutput port OUT of the integrator circuit INTAMP can be connected to theanalog-to-digital converter ADC.

Referring to FIG. 22 , the plurality of simultaneous driving amplifiersSDAMP output the sensing signals SS1, SS2, . . . , and SSn sensedthrough the plurality of data lines DL1, DL2, . . . , and DLn,respectively, at every set times (e.g., 1H, 2H, or 1.6H). Here, the settime (e.g., 1H, 2H, or 1.6H) can correspond to a time at which each ofthe m number of gate lines GL is scanned. For example, the set time(e.g., 1H, 2H, or 1.6H) can correspond to the length of the turn-onvoltage level of the gate signal GATE applied to each of the m number ofgate lines GL.

The feedback capacitor Cfb of each of the plurality of simultaneousdriving amplifiers SDAMP should be repeatedly charged and reset at everyset times (e.g., 1H, 2H, or 1.6H).

In this regard, a feedback reset switch SWfb can be connected to bothends of the feedback capacitor Cfb of each of the plurality ofsimultaneous driving amplifiers SDAMP. Due to the feedback reset switchSWfb, the feedback capacitor Cfb can be repeatedly charged (discharged).

The plurality of delivery capacitors C1, C2, . . . , and Cn should berepeatedly charged and reset at every set times (e.g., 1H, 2H, or 1.6H).In this regard, a delivery reset switch SWt can be connected to one endof each of the plurality of delivery capacitors C1, C2, . . . , and Cn.

When the plurality of delivery reset switches SWt are turned off, theelectric charges of the feedback capacitors Cfb in the plurality ofsimultaneous driving amplifiers SDAMP are delivered to the plurality ofdelivery capacitors C1, C2, . . . , and Cn.

When each of the plurality of delivery reset switches SWt is turned on,each of the plurality of delivery capacitors C1, C2, . . . , and Cn isreset. Here, the reset of each of the plurality of delivery capacitorsC1, C2, . . . , and Cn can mean that the electric charge stored in eachof the plurality of delivery capacitors C1, C2, . . . , and Cn exitsthrough the reference voltage node REF.

The electric charge, newly stored in each of the plurality of deliverycapacitors C1, C2, . . . , and Cn at every set times (e.g., 1H, 2H, or1.6H), is cumulatively charged in the integration capacitor Cint in theintegrator circuit INTAMP.

While all of the m number of gate lines GL are being driven, each of then number of simultaneous driving amplifiers SDAMP detects the sensingsignal through the corresponding data line m times, and each of the nnumber of delivery capacitors C1, C2, . . . , and Cn stores the sensingsignal, output to the corresponding simultaneous driving amplifierSDAMP, m times. The integrator circuit INTAMP outputs an integratedsensing signal one time.

The integration capacitor Cint in the integrator circuit INTAMP shouldbe repeatedly charged and reset at every driving times of a single touchsensor block TSB. In this regard, an integration switch SWint for thecharging and reset (discharging) of the integration capacitor Cint canbe connected to both ends of the integration capacitor Cint.

Referring to FIG. 23 , the n number of feedback reset switches SWfbconnected to both ends of the feedback capacitors Cfb in the n number ofsimultaneous driving amplifiers SDAMP and the n number of delivery resetswitches SWt connected to the plurality of delivery capacitors C1, C2, .. . , and Cn, to which the electric charges of the feedback capacitorsCfb in the plurality of simultaneous driving amplifiers SDAMP aredelivered, can be repeatedly turned on/off at the same times (the sametiming).

The on/off periods of the n number of feedback reset switches SWfb andthe n number of delivery reset switches SWt correspond to the drivingtimes of the m number of gate lines GL.

For example, while the m number of gate lines GL are being scanned, then number of feedback reset switches SWfb and the n number of deliveryreset switches SWt can be repeatedly turned-off and turned-on m times.

Referring to FIG. 23 , while the n number of feedback reset switchesSWfb and the n number of delivery reset switches SWt are beingrepeatedly turned on and off, the integration switch SWint in theintegrator circuit INTAMP remains in the turn-off state.

After the completion of the mth turning-off of the n number of feedbackreset switches SWfb and the n number of delivery reset switches SWt, theintegration switches SWint in the integrator circuit INTAMP can beturned on.

In addition, as described above, the video data signal Vdata for theimage display is used as the touch driving signal for the touch sensing,so that the display can be influenced by the touch sensing. A drivingtiming control method for reducing or removing the effect on thedisplay, which would be caused by simultaneous performance of thedisplay driving and the touch sensing, will be described hereinafter.

FIG. 24 is a diagram illustrating fake driving for improving the motionpicture response time (MPRT) of the display device 100 according to oneor more embodiments, and FIG. 25 is a diagram illustrating the videodata signal Vdata serving as a touch driving signal in a case in whichthe touch driving is performed in association with the fake driving forimproving the MPRT of the display device 100 according to one or moreembodiments.

Referring to FIG. 24 , the display panel 110 can display a fake videowhile displaying real videos during a frame time. For example, the frametime can include a real video display segment VD, in which a real videois displayed, and a fake video display segment FVD corresponding to theblank segment blank, in which a fake video different from the real videois displayed.

The real video is a video that the user intends to display.

The fake video is a video different from the real video, and is not avideo that the user intends to display.

The fake video is generated internally by the display device 100,irrespective of the user's intention, to improve the MPRT.

The fake video corresponds to a virtual video inserted between realvideos. For example, the fake video can be a black video, a low-grayvideo, or the like.

The data driver 120 can output a fake video data signal corresponding tothe fake video to display the fake video different from the real video.

The fake video data signal can correspond to the video data signal Vdataincluding the first signal segment S1 and the second signal segment S2having the predetermined voltage difference ΔV.

To display the fake video different from the real video, the data driver120 writes the fake video data signal in the corresponding subpixel SPby outputting the fake video data signal corresponding to the fake videoat a point in time preceding the fake video display segment FVD. This isreferred to as fake video insertion driving or black video insertiondriving.

The fake video data signal can be supplied to subpixels SP disposed in asingle row of subpixels.

In addition, the fake video data signal can be simultaneously suppliedto subpixels SP disposed in two or more rows of subpixels.

In this case, when the gate signal GATE having the turn-on voltage levelis simultaneously supplied to two or more gate lines GL among theplurality of gate lines GL, the simultaneous driving circuit 1130 in thedata driver 120 can simultaneously supply the fake video data signal tosubpixels SP included in two or more rows of subpixels corresponding tothe two or more gate lines GL.

According to the fake video insertion driving, the fake video datasignal can correspond to a low-gray voltage, such as a black datavoltage.

For example, in a case in which the gray of a video displayed changes ina range from 0 gray (e.g., 7V) to 255 gray (e.g., 15V), the low gray canbe 0 gray, and the low-gray voltage can be 7V.

Accordingly, as illustrated in FIG. 25 , the fake video data signal canswing while having the first signal segment S1 and the second signalsegment S2 having the predetermined voltage difference ΔV, at a voltageequal to or lower than the low-gray voltage (e.g., a voltage of 0 gray),so that the fake video data signal functions as the touch driving signalfor the above-described simultaneous driving.

In this case, the voltage value of the second signal segment S2 of thefake video data signal can be a predetermined voltage value. Thus, thevoltage value of the first signal segment S1 having the predeterminedvoltage difference ΔV from the voltage value of the second signalsegment S2 can be a predetermined voltage value.

For example, in a case in which the touch driving is performed attimings of the fake video insertion driving (e.g., black video insertiondriving), the video data signal Vdata corresponding to the fake videodata signal (e.g., a black video data signal) can be a pulse signalwhich swings with an amplitude corresponding to the predeterminedvoltage difference ΔV between the first signal segment S1 having apredetermined first voltage value (e.g., 0V) and the second signalsegment S2 having a predetermined second voltage value (e.g., a voltagevalue of 7V or lower).

As described above, the touch sensing can be performed while the displayeffect is minimized or removed. Accordingly, both the displayperformance and the touch sensing performance can be improved.

Hereinafter, the driving method of the display device 100 according toone or more embodiments, as described above, will be briefly describedagain.

FIG. 26 is a flowchart illustrating the driving method of the displaydevice 100 according to one or more embodiments.

Referring to FIG. 26 , the driving method of the display device 100according to one or more embodiments can include operation S2610 ofsupplying the video data signal Vdata including the first signal segmentS1 and the second signal segment S2 maintaining the predeterminedvoltage difference ΔV to each of the plurality of data lines DL;operation S2620 of generating readout data in response to signal sensingthrough each of the plurality of data lines DL to which the video datasignal Vdata is supplied; operation S2630 of detecting a touch ordetermining touch coordinates on the basis of the readout data; and thelike.

According to embodiments as set forth above, both the display drivingand the touch sensing can be performed even in a case in which aseparate touchscreen panel is not provided. Accordingly, the size of thedisplay device 100 can be reduced, and the ease of fabrication of thedisplay device 100 can be increased.

In addition, according to exemplary embodiments, the display driving andthe touch sensing can be simultaneously performed. Accordingly,high-resolution images can be displayed, and a sufficient amount of timefor the touch sensing can be obtained.

In addition, according to exemplary embodiments, the touch sensing canbe performed, even in a case in which a dedicated touch sensor structureis not separately provided.

In addition, according to exemplary embodiments, the touch sensing canbe performed using the subpixels designed for the display driving.Accordingly, a process of fabricating dedicated touch sensors in thepanel is unnecessary, and the thickness of the panel can be reduced.

In addition, according to exemplary embodiments, the touch driving canbe performed using the video data signal intended for the displaydriving. Accordingly, it is unnecessary to generate a touch drivingsignal for the touch driving, and a driving operation can be easier.

The above description has been presented to enable any person skilled inthe art to make and use the technical idea of the present invention, andhas been provided in the context of a particular application and itsrequirements. Various modifications, additions and substitutions to thedescribed embodiments will be readily apparent to those skilled in theart, and the general principles defined herein can be applied to otherembodiments and applications without departing from the spirit and scopeof the present invention. The above description and the accompanyingdrawings provide an example of the technical idea of the presentinvention for illustrative purposes only. For example, the disclosedembodiments are intended to illustrate the scope of the technical ideaof the present invention. Thus, the scope of the present invention isnot limited to the embodiments shown, but is to be accorded the widestscope consistent with the claims. The scope of protection of the presentinvention should be construed based on the following claims, and alltechnical ideas within the scope of equivalents thereof should beconstrued as being included within the scope of the present invention.

What is claimed is:
 1. A display device comprising: a display panel inwhich a plurality of data lines and a plurality of gate lines aredisposed and a plurality of subpixels are arranged; a data driverconfigured to supply a video data signal including a first signalsegment and a second signal segment maintaining a predetermined voltagedifference to each of the plurality of data lines, and output readoutdata in response to signal sensing through each of the plurality of datalines to which the video data signal is supplied; and a touch controllerconfigured to detect a touch or determine touch coordinates inaccordance with the readout data, wherein the video data signal servesas both a display driving signal for image display and a touch drivingsignal for touch driving, and wherein in the video data signal, thesecond signal segment has a variable voltage representing a gray levelfor the image display, the predetermined voltage difference between thefirst signal segment and the second signal segment is substantiallyconstantly maintained so that the video data signal serves as a touchdriving signal for touch sensing, and the first signal segment has avariable voltage configured to maintain the predetermined voltagedifference in accordance with the variable voltage of the second signalsegment.
 2. The display device according to claim 1, wherein the firstsignal segment and the second signal segment are defined for apredetermined time, and wherein the predetermined time is a real numbertimes one-horizontal time.
 3. The display device according to claim 2,wherein the predetermined time corresponds to a period for which acorresponding gate line of the plurality of gate lines has a turn-onvoltage level.
 4. The display device according to claim 1, wherein avoltage value of the second signal segment varies in accordance with avariation in a video frame as a substantial voltage value for the imagedisplay.
 5. The display device according to claim 1, wherein, even in acase in which a voltage value of each of the first signal segment andthe second signal segment supplied to each of the plurality of datalines changes, the voltage difference between the first signal segmentand the second signal segment is maintained to be constant.
 6. Thedisplay device according to claim 1, wherein, during a period in which agate signal having a turn-on voltage level is sequentially supplied toeach of m number of gate lines among the plurality of gate lines, wherethe m is a natural number equal to or greater than 2, the data driveroutputs the readout data regarding a single touch sensor block, based onsensing signals sensed through each of n number of data lines among theplurality of subpixels, respectively, where the n is a natural numberequal to or greater than 2, the single touch sensor block correspondingto subpixels defined by the m number of gate lines and the n number ofdata lines, among the plurality of subpixels.
 7. The display deviceaccording to claim 6, wherein the single touch sensor block is anassembly of storage capacitor plates respectively being one of a firstplate and a second plate of a storage capacitor included in each of thesubpixels defined by the m number of gate lines and the n number of datalines.
 8. The display device according to claim 1, wherein each of theplurality of subpixels includes: an emitting device; a drivingtransistor configured to drive the emitting device and including a firstnode, a second node, and a third node; a first transistor electricallyconnected between the first node and a data line among the plurality ofdata lines; and a storage capacitor electrically connected between thefirst node and the second node and including a first plate and a secondplate, the first plate of the storage capacitor being electricallyconnected to the first node of the driving transistor, and the secondplate being electrically connected to the second node of the drivingtransistor.
 9. The display device according to claim 1, furthercomprising a plurality of shield lines present corresponding to theplurality of data lines to shield the plurality of data lines andsurrounding conductors located around the plurality of data lines fromeach other, wherein the data driver supplies a shield driving signal toeach of the plurality of shield lines, the shield driving signalcorresponding to the video data signal supplied to a corresponding dataline among the plurality of data lines.
 10. The display device accordingto claim 6, wherein the gate signal includes a segment, a voltage levelof which changes by an amplitude corresponding to the voltage differencebetween the first signal segment and the second signal segment of thevideo data signal.
 11. The display device according to claim 1, whereinthe data driver includes a simultaneous driving circuit driving theplurality of data lines for display driving and sensing the plurality ofdata lines for touch sensing, the simultaneous driving circuit includesa plurality of simultaneous driving amplifiers supplying the video datasignal to the plurality of data lines, respectively, and sensing theplurality of data lines, respectively, and each of the plurality ofsimultaneous driving amplifiers includes: an operation amplifierincluding a first input port through which the video data signal isinput, a second input port connected to a data line among the pluralityof data lines to output the video data signal, input through the firstinput port, to the data line, and an output port outputting a sensingsignal sensed through the data line; and a feedback capacitorelectrically connected to the second input port and the output port. 12.The display device according to claim 11, wherein the simultaneousdriving circuit further includes a plurality of output buffers supplyingthe video data signal to the plurality of data lines, respectively, eachof the plurality of output buffers includes a buffer input port throughwhich the video data signal is input and a buffer output portelectrically connected to the data line, and the data line iselectrically connected to the second input port of each of the pluralityof simultaneous driving amplifiers during a first driving timing periodand is electrically connected to the buffer output port of each of theplurality of output buffers during a second driving timing period afterthe first driving timing period.
 13. The display device according toclaim 12, wherein the video data signal includes the first signalsegment, the second signal segment continuing from the first signalsegment, and a third signal segment continuing from the second signalsegment, a voltage difference between the second signal segment and thethird signal segment is zero or smaller than the voltage differencebetween the first signal segment and the second signal segment, thefirst signal segment and the second signal segment of the video datasignal are output to a corresponding data line among the plurality ofdata lines through a simultaneous driving amplifier among the pluralityof simultaneous driving amplifiers during the first driving timingperiod, and the third signal segment of the video data signal is outputto the corresponding data line through a corresponding output bufferamong the plurality of output buffers during the second driving timingperiod of the video data signal.
 14. The display device according toclaim 1, wherein the display panel displays a fake video whiledisplaying a real video, the data driver outputs the fake video datasignal corresponding to the fake video as the video data signalincluding the first signal segment and the second signal segment havingthe predetermined voltage difference, and the fake video is a blackvideo or a low-gray video.
 15. The display device according to claim 1,wherein the video data signal includes a first video data signalsupplied to a first data line among the plurality of data lines and asecond video data signal supplied to a second data line among theplurality of data lines, and wherein a voltage difference between thefirst signal segment and the second signal segment of the first videodata signal Vdata1 and a voltage difference between the first signalsegment and the second signal segment of the second video data signalare same or correspond to each other.
 16. A data driver for driving aplurality of data lines disposed in a display panel, the data drivercomprising: a latch circuit configured to store video data; adigital-to-analog converter configured to convert the video data into ananalog video signal in a form of an analog voltage; and a simultaneousdriving circuit configured to supply a video data signal based on theanalog video signal to each of the plurality of data lines, the videodata signal including a first signal segment and a second signal segmentmaintaining a predetermined voltage difference, the simultaneous drivingcircuit further configured to output readout data in response to signalsensing through each of the plurality of data lines to which the videodata signal is supplied, wherein the video data signal serves as both adisplay driving signal for image display and a touch driving signal fortouch driving, and wherein in the video data signal, the second signalsegment has a variable voltage representing a gray level for imagedisplay, the predetermined voltage difference between the first signalsegment and the second signal segment is substantially constantlymaintained so that the video data signal serves as a touch drivingsignal for touch sensing, and the first signal segment has a voltageconfigured to maintain the predetermined voltage difference inaccordance with the variable voltage of the second signal segment. 17.The data driver according to claim 16, wherein the first signal segmentand the second signal segment are defined for a predetermined time, andwherein the predetermined time corresponds to a period for which acorresponding gate line of the plurality of gate lines has a turn-onvoltage level.
 18. The data driver according to claim 16, wherein avoltage value of the second signal segment varies in accordance with avariation in a video frame as a substantial voltage value for the imagedisplay.
 19. The data driver according to claim 16, wherein, during aperiod in which a gate signal having a turn-on voltage level issequentially supplied to each of m number of gate lines among theplurality of gate lines, where the m is a natural number equal to orgreater than 2, the simultaneous driving circuit outputs the readoutdata regarding a single touch sensor block, based on sensing signalssensed through each of n number of data lines among the plurality ofdata lines, respectively, where the n is a natural number equal to orgreater than 2, the single touch sensor block corresponding to subpixelsdefined by the m number of gate lines and the n number of data lines,among the plurality of subpixels.
 20. The data driver according to claim16, wherein the simultaneous driving circuit includes a shield driverelectrically connected to a plurality of shield lines presentcorresponding to the plurality of data lines to shield the plurality ofdata lines and surrounding conductors located around the plurality ofdata lines from each other, and wherein the shield driver supplies ashield driving signal to each of the plurality of shield lines, theshield driving signal corresponding to the video data signal supplied toa corresponding data line among the plurality of data lines.